|To:||Ward Silver <email@example.com>,"Towertalk Reflector" <firstname.lastname@example.org>|
|Subject:||Re: [TowerTalk] Re: Horizontal + Vertical Polarization Question|
|From:||Jim Lux <email@example.com>|
|Date:||Fri, 21 Nov 2003 10:38:17 -0800|
At 09:17 AM 11/21/2003 -0800, Ward Silver wrote:
> AA6E writes: > > It would be very interesting(!) if someone were to actually measure the > incident polarization of typical skywave signals (actually, someone > probably has.. the radio astronomy folks working at HF have to deal with > nulling out interferers, etc., and I'm sure some one in the SW broadcast > business has looked at this), particularly in terms of the short time > statistics.
I have found some stuff online from the 70's or so. Incident noise power statistics, etc.
For the long distance HF links (which the US did too... my father worked at the Far East Network in Japan in the 50's), I think they also just relied on BIG antennas (rhombics and curtains) and BIG transmitters and just piled up enough link margin so cross polarization was immaterial.
I'll keep poking around, but, you get far enough back and it's not online, except titles and authors, which doesn't always cover the need. However, sometimes, the paper from the 70's will have a reference to the paper from the 40's and 50's, and then I can request that from the library.
The other thing is that a lot of this sort of thing got (and still does) published as "technical memoranda" or "technical notes", rather than in journals, being considered mere "engineering data". The indexing of this is much more sparse.
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
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